Institution: | 1. Regional Mathematical Center of Southern Federal University, Bolshaya Sadovaya, 105/42, Rostov-on-Don, 344006 Russia;2. Faculty of Engineering, Autonomous University of Queretaro, Qro. C.P. 76010, Cerro de las Campanas s/n, col. Las Campanas Querétaro, México;3. Department of Mathematics, Cinvestav, Unidad Querétaro Libramiento Norponiente #2000, Fracc. Real de Juriquilla, Querétaro, Qro. C.P. 76230 México |